Glossary
Analytical Terms
Process analyser terms: pH, ORP, conductivity, dissolved oxygen, turbidity, gas analysis, LEL, zirconia oxygen, CEMS and sample systems.
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All Analytical Terms
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TermAnalyser ShelterAn analyser shelter is a ventilated building or cabinet that protects process analysers and…TermBuffer SolutionA buffer solution has a stable, known pH and resists change, and is used to calibrate pH electrodes.KCell ConstantCell constant is the geometry factor of a conductivity cell, the electrode spacing divided by…FormulaConductivityConductivity is the ability of a solution to carry electric current, which rises with the…FormulaConductivity Temperature CompensationConductivity temperature compensation converts measured conductivity to the value at a…CEMSContinuous Emission Monitoring SystemA continuous emission monitoring system measures pollutants and flow in a stack continuously,…DODissolved OxygenDissolved oxygen is the amount of oxygen gas dissolved in water, measured in mg/L or as % of…FormulaEmission Oxygen CorrectionEmission oxygen correction converts a measured pollutant concentration to a reference oxygen…
FormulaExcess AirExcess air is the air supplied to a burner beyond the theoretical amount needed for complete…GCGas ChromatographA gas chromatograph separates a gas or vaporised liquid sample into components in a column and…LELLower Explosive LimitLower explosive limit is the lowest concentration of a flammable gas in air that can ignite;…FormulaNDIR Gas AnalyserAn NDIR gas analyser measures gases such as CO₂, CO and methane from how much infrared light…FormulaNernst SlopeNernst slope is the theoretical change in electrode voltage per pH unit, 59.16 mV at 25 °C,…ORPOxidation Reduction PotentialOxidation reduction potential is the voltage that shows whether a solution tends to oxidise or…FormulapHpH is a measure of how acidic or alkaline a water based solution is, based on the hydrogen ion…TermpH ElectrodeA pH electrode is a sensor with a pH sensitive glass membrane and a reference electrode,…
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FormulapH Temperature CompensationpH temperature compensation corrects the electrode slope for sample temperature, so the…Formulappm to mg/m³ Conversionppm to mg/m³ conversion turns a gas concentration by volume into mass per volume, using the…TermReference ElectrodeA reference electrode provides a stable voltage against which the pH or ORP measuring electrode…TermSample Conditioning SystemA sample conditioning system takes a process sample and makes it suitable for the analyser:…FormulaSample Lag TimeSample lag time is the delay for a sample to travel from the process tap to the analyser.FormulaSpan GasSpan gas is a certified gas mixture with a known concentration, used to set the upper…TDSTotal Dissolved SolidsTotal dissolved solids is the mass of dissolved substances in water, often estimated from…TermTurbidityTurbidity is the cloudiness of water caused by suspended particles, measured by how much light…
Frequently Asked Questions
What does the analytical glossary cover?
Process analyser terms: pH, ORP, conductivity, dissolved oxygen, turbidity, gas analysis, LEL, zirconia oxygen, CEMS and sample systems.
Are the formulas checked?
Yes. Formulas follow the relevant standards such as ISO 5167, and every worked example is calculated and checked.
Other Glossary Sections
32 termsFlow MeasurementFlow measurement terms: flow rate, Reynolds number, beta ratio, K factor, turndown, meter types and gas flow conditions.32 termsPressure MeasurementPressure terms: gauge, absolute and differential pressure, transmitter ranges, gauges, seals and relief valve terms.29 termsLevel MeasurementLevel terms: hydrostatic and DP level, wet and dry legs, radar, ultrasonic, displacer, switches, tank volume and ullage.29 termsTemperature MeasurementTemperature terms: RTD, Pt100, thermocouples, cold junction, thermowells, response time, pyrometers and heat transfer.30 termsControl ValveControl valve terms: Cv and Kv, characteristics, authority, cavitation, choked flow, leakage class, actuators, positioners and fail action.31 termsSafety and SISFunctional safety and hazardous area terms: SIS, SIL, PFDavg, voting, proof testing, LOPA, alarms, zones, gas groups and Ex protection.29 termsSignals and PLCSignal and PLC terms: 4 to 20 mA, HART, Modbus, RS485, fieldbus, isolation, grounding, scaling, scan time and digital I/O.28 termsCalibrationCalibration and metrology terms: accuracy, repeatability, hysteresis, uncertainty, TUR, traceability, guard bands, as found and as left.CalculatorsCalculatorsFree engineering calculators for flow, level, pressure, temperature and more.
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